diff --git a/include/linux/cryptohash.h b/include/linux/cryptohash.h
new file mode 100644
index 0000000..c118b2ad
--- /dev/null
+++ b/include/linux/cryptohash.h
@@ -0,0 +1,12 @@
+#ifndef __CRYPTOHASH_H
+#define __CRYPTOHASH_H
+
+#define SHA_DIGEST_WORDS 5
+#define SHA_WORKSPACE_WORDS 80
+
+void sha_init(__u32 *buf);
+void sha_transform(__u32 *digest, const char *data, __u32 *W);
+
+__u32 half_md4_transform(__u32 buf[4], __u32 const in[8]);
+
+#endif